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Update docs for CStr::from_ptr.

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Markus Reiter
2022-10-12 13:12:27 +02:00
parent 328f81713c
commit 36dbb07daf
1 changed files with 13 additions and 4 deletions
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library/core/src/ffi/c_str.rs
+13 -4
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@@ -221,9 +221,7 @@ impl CStr {
/// # Examples
///
/// ```ignore (extern-declaration)
/// # fn main() {
/// use std::ffi::CStr;
/// use std::os::raw::c_char;
/// use std::ffi::{c_char, CStr};
///
/// extern "C" {
/// fn my_string() -> *const c_char;
@@ -233,7 +231,18 @@ impl CStr {
/// let slice = CStr::from_ptr(my_string());
/// println!("string returned: {}", slice.to_str().unwrap());
/// }
/// # }
/// ```
///
/// ```
/// #![feature(const_cstr_methods)]
///
/// use std::ffi::{c_char, CStr};
///
/// const HELLO_PTR: *const c_char = {
/// const BYTES: &[u8] = b"Hello, world!\0";
/// BYTES.as_ptr().cast()
/// };
/// const HELLO: &CStr = unsafe { CStr::from_ptr(HELLO_PTR) };
/// ```
///
/// [valid]: core::ptr#safety